Computational Intelligence in Analysis of Electromyography Signals - Computational Intelligence in Biomedical Engineering - page 223

C5

C6

Upper, middle, and lower trunks

C7

C8

T1

Posterior cord

Radial nerve

FIGURE 5.11
The radial nerve is derived from the posterior cord of the brachial plexus. It
receives innervation from all three trunks of the brachial plexus and con-
tributions from the C5-T1 nerve roots. (Reprinted with permission from
Preston, D., and Shapiro, B., Electromyography and Neuromuscular Disorders:
Clinical-Electrophysiologic Correlations , Elsevier, Philadelphia, PA, 2005.)

associated with several disorders such as diabetes, herpes zoster, lymphoma,
leprosy, and stroke. The symptoms depend on the location, pathophysiology,
and severity of the lesion, for example, a central lesion presents as weakness
in the lower facial region. Compression and injury to the facial nerve can also
cause hemifacial spasm, which is characterized by involuntary contractions
and spasms in the face. Trigeminal neuropathy is another disorder affecting
the trigeminal nerve (cranial nerve V), which is responsible for carrying nerve
impulses to the face and motor fibers. Damage or dysfunction in this nerve
causes numbness over the ipsilateral face and diculty in opening the mouth
or chewing. Trigeminal neuralgia is a less common disorder where severe pain